| | Corvallis, MT | Eagle, ID | United States |
| Population | 1,604 | 29,665 | 329,725,481 |
| Female Population | 44.5% | 51.0% | 50.5% |
| Male Population | 55.5% | 49.0% | 49.5% |
| Median Age | 36.5 | 45.5 | 38.4 |
| space3 | | | |
| Population - 2010 | 616 | 20,012 | 309,327,143 |
| Population - 2000 | 443 | 11,085 | 285,036,114 |
| Population - 1990 | 524 | 3,327 | 251,960,433 |
| Pop. 2000 to Now | 167.0% | 186.0% | 15.6% |
| Pop. 1990 to Now | 125.8% | 852.8% | 30.8% |
| space4 | | | |
| Population Density | 2,779.9 | 974.5 | 93.4 |
| Land Area | 0.6 | 30.4 | 3,531,905.4 |
| Water Area | 0.0 | 0.5 | 264,836.8 |
| space | | | |
| Est. Total Population By Age | | | |
| | Corvallis, MT | Eagle, ID | United States |
| Age 0 to 4 | 8.6% | 5.3% | 5.9% |
| Age 5 to 9 | 7.5% | 5.6% | 6.1% |
| Age 10 to 14 | 7.9% | 8.5% | 6.6% |
| Age 15 to 17 | 3.1% | 5.3% | 3.9% |
| Age 18 to 20 | 1.3% | 2.8% | 4.0% |
| Age 21 to 24 | 3.0% | 1.9% | 5.2% |
| Age 25 to 34 | 16.8% | 7.7% | 13.8% |
| Age 35 to 44 | 16.1% | 12.2% | 12.9% |
| Age 45 to 54 | 5.3% | 13.3% | 12.6% |
| Age 55 to 59 | 9.9% | 8.4% | 6.7% |
| Age 60 to 64 | 1.7% | 7.0% | 6.3% |
| Age 65 to 74 | 13.0% | 14.2% | 9.6% |
| Age 75 to 84 | 5.8% | 6.3% | 4.5% |
| Age 85 and over | 0.0% | 1.5% | 1.9% |
| space1 | | | |
| Race | | | |
| | Corvallis, MT | Eagle, ID | United States |
| White | 92.4% | 85.6% | 59.4% |
| Black | 0.0% | 0.6% | 12.2% |
| Asian | 0.0% | 1.7% | 5.6% |
| Native American | 1.4% | 0.4% | 0.6% |
| Hawaiian, Pacific Islander | 0.0% | 0.4% | 0.2% |
| Other | 0.0% | 0.2% | 0.4% |
| Two or More Races | 2.7% | 3.0% | 3.2% |
| Hispanic | 3.5% | 8.1% | 18.4% |
| space2 | | | |
| Marriage & Family | | | |
| | Corvallis, MT | Eagle, ID | United States |
| Married Population | 52.4% | 67.2% | 49.8% |
| Currently Married | 52.4% | 67.0% | 48.0% |
| Married but Separated | 0.0% | 0.1% | 1.8% |
| Single Population | 47.6% | 32.8% | 50.2% |
| Never Married | 9.7% | 20.3% | 33.8% |
| Divorced | 29.6% | 7.7% | 10.8% |
| Widowed | 8.3% | 4.9% | 5.6% |
| space5 | | | |
| Household Size | 2.76 | 2.64 | 2.60 |
| Households | 581 | 11,221 | 124,010,992 |
| Family Households | 507 | 8,869 | 80,755,759 |
| Married couple, w/children | 48.3% | 32.3% | 30.5% |
| Married couple, no children | 16.6% | 54.8% | 42.9% |
| Non Family Households | 74 | 2,352 | 43,255,233 |
| Single householder, w/children | 4.3% | 9.4% | 15.8% |
| Single householder, no children | 30.8% | 3.6% | 10.8% |